Vietnamese pottery factories generally use biomass as their primary fuel source. This includes wood, agricultural residues, and other organic materials. The preference for biomass is due to its availability and cost-effectiveness in Vietnam. According to a report by the Vietnam Energy Agency, biomass accounts for approximately 70% of the total energy consumption in the pottery industry in Vietnam. This reliance on biomass is also influenced by the country's abundant forest resources and the traditional methods of pottery production that have been passed down through generations.